Morphometric Analysis as a Tool to Resolve a Taxonomic Complex in Myrcia sect. Calyptranthes (Myrtaceae, Myrteae)

Abstract— Specimens attributed to Myrcia chytraculia and associated species form a complex within M. sect. Calyptranthes, occurring sympatrically throughout the Caribbean and Central America and sharing a continuously variable suite of morphometric traits. To ascertain whether species within this complex should be treated as separate or conspecific taxa, seven morphometric traits and a further two discrete characters are analysed using univariate and multivariate statistics. Leaf size and shape are found to be indicative of subspecies, and significant mean differences of traits can be found between groups, though they overlap throughout the range of the M. chytraculia complex. As a result of these findings, updated taxonomy for this group is proposed, creating the new combinations Myrcia chytraculia var. americana, Myrcia chytraculia var. pauciflora, and M. chytraculia var. zuzygium, as well as seven new synonyms. A distribution map and a key to the new varieties are also included.

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Use of Leaf and Fruit Morphometric Analysis to Identify and Classify White Mulberry (Morus alba L.) Genotypes

Agriculture ◽

10.3390/agriculture8100157 ◽

2018 ◽

Vol 8 (10) ◽

pp. 157 ◽

Cited By ~ 1

Author(s):

Riccardo Lo Bianco ◽

Fabio Mirabella

Keyword(s):

Image Analysis ◽

Leaf Size ◽

Morus Alba ◽

Leaf Margin ◽

Morphometric Traits ◽

Linear Discriminant ◽

White Mulberry ◽

Leaf Size And Shape ◽

Classification Tool ◽

Apical Tooth

Digital image analysis and multivariate data analysis were used in this study to identify a set of leaf and fruit morphometric traits to discriminate white mulberry (Morus alba L.) cultivars. The trial was conducted using three- to five-year-old potted cuttings of several white mulberry cultivars. 32 leaf morphometric descriptors were recorded in 2011 and 2012 from 11 mulberry cultivars using image analysis of scanned leaves, whereas six fruit descriptors were recorded in 2011 from nine mulberry cultivars. Linear discriminant analysis (LDA) was used to identify a subset of measured variables that could discriminate the cultivars in trial. Biplot analysis, followed by cluster analysis, was performed on the discriminant variables to investigate any possible cultivar grouping based on similar morphometric traits. LDA was able to discriminate the 11 cultivars with a canonical function, which included 13 leaf descriptors. Using those 13 descriptors, the Biplot showed that over 84% of the variability could be explained by the first three factors. Clustering of standardized biplot coordinates recognized three groups: the first including ‘Korinne’ and ‘Miura’ with similar leaf angles and apical tooth size; the second including ‘Cattaneo’, ‘Florio’, ‘Kokusò-21’, ‘Kokusò-27’, and ‘Kokusò Rosso’ with similar leaf size and shape; and the third including ‘Ichinose’, ‘Kayrio’, ‘Morettiana’, and ‘Restelli’, with similar leaf margin. Fruit descriptors were fewer and measured on fewer cultivars, yielding smaller discriminatory power than leaf descriptors. Use of leaf morphometric descriptors, along with image and multivariate analysis, proved to be effective for discriminating mulberry cultivars and showed promise for the implementation of a simple and inexpensive characterization and classification tool.

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Myrcia sect. Calyptranthes (Myrtaceae) from the Atlantic Forest, Brazil

Phytotaxa ◽

10.11646/phytotaxa.460.1.2 ◽

2020 ◽

Vol 460 (1) ◽

pp. 12-58

Author(s):

ANA RAQUEL LOURENÇO ◽

GEORGE P. BURTON ◽

MARCCUS ALVES ◽

EVE LUCAS

Keyword(s):

Atlantic Forest ◽

Leaf Size ◽

Taxonomic Revision ◽

Morphological Characters ◽

Species Determination ◽

New Synonyms ◽

Taxonomic Descriptions ◽

Leaf Size And Shape ◽

One New Species

Myrcia sect. Calyptranthes is a section of the Neotropical genus Myrcia ranging from Mexico and the Caribbean to northern Argentina with ca. 260 known species. In Brazil ca. 78 species are known, of which ca. 53 are endemic, occurring mainly in the Atlantic and Amazon domains, with few species in the Caatinga and Cerrado. This paper is a taxonomic revision of 38 species from the Atlantic Forest including one newly described species Myrcia botryophylla. The treatment provides an identification key, taxonomic descriptions, phenology and geographic distribution information, nomenclatural updates, synonymy, and illustrations of the main morphological characters. The main character used for differentiating species is inflorescence pattern, but observation of several further characters including leaf size and shape, flower buds and indument assists in species determination. Of the 38 species recognized 29 are endemic to the Atlantic Forest domain and 9 occur in the Amazon, Cerrado and/or other habitats in South and Central America. Twenty-two new synonyms are proposed, two new combinations are made and 29 lectotypes are designated. One new species is described.

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Rare sporophyte found in Europe for Herbertus sendtneri with a range expansion to Africa and Malesia

Phytotaxa ◽

10.11646/phytotaxa.324.1.2 ◽

2017 ◽

Vol 324 (1) ◽

pp. 42

Author(s):

XIAOLAN HE ◽

YU SUN

Keyword(s):

Northern Hemisphere ◽

Solomon Islands ◽

Leaf Size ◽

Herbarium Specimens ◽

Leaf Base ◽

New Synonyms ◽

Morphological Studies ◽

Phylogenetic Studies ◽

Molecular Phylogenetic ◽

Leaf Size And Shape

The sporophytes of the genus Herbertus are rare or completely absent in some areas. The first discovery of the sporophyte of Herbertus in Europe, on H. sendtneri from a herbarium specimen collected in Austria in 1851, is reported here. We report that finely papillose spores characterize Herbertus species which have originated in the Northern Hemisphere, whereas the spores of the species which have originated in the Southern Hemisphere are tuberculate or shortly spinulose. Based on morphological studies of over 600 herbarium specimens of Herbertus, supported by previously published molecular phylogenetic studies, H. armitanus and H. circinatus are new synonyms of H. sendtneri. It is distinct from other Northern Hemisphere species by its coarsely toothed leaf base, despite large variation in leaf size and shape, and leaf apex cilia. The range of H. sendtneri is now extended to east Africa (Tanzania) and Malesia (Papua New Guinea and the Solomon Islands).

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Local Histories/Global Designs

10.23943/princeton/9780691156095.001.0001 ◽

2012 ◽

Cited By ~ 1

Author(s):

Walter D. Mignolo

Keyword(s):

Social Sciences ◽

Central America ◽

Postcolonial Studies ◽

The United States ◽

Philosophy Of History ◽

South Central ◽

The Social ◽

The Caribbean ◽

Border Thinking ◽

East West

This book is an extended argument about the “coloniality” of power. In a shrinking world where sharp dichotomies, such as East/West and developing/developed, blur and shift, this book points to the inadequacy of current practices in the social sciences and area studies. It explores the crucial notion of “colonial difference” in the study of the modern colonial world and traces the emergence of an epistemic shift, which the book calls “border thinking.” Further, the book expands the horizons of those debates already under way in postcolonial studies of Asia and Africa by dwelling on the genealogy of thoughts of South/Central America, the Caribbean, and Latino/as in the United States. The book's concept of “border gnosis,” or sensing and knowing by dwelling in imperial/colonial borderlands, counters the tendency of occidentalist perspectives to manage, and thus limit, understanding. A new preface discusses this book as a dialogue with Hegel's Philosophy of History.

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